// concurrent/CompletablePizza.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.

import onjava.Timer;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class CompletablePizza {
    static final int QUANTITY = 5;

    public static CompletableFuture<Pizza>
    makeCF(Pizza za) {
        return CompletableFuture
                .completedFuture(za)
                .thenApplyAsync(Pizza::roll)
                .thenApplyAsync(Pizza::sauce)
                .thenApplyAsync(Pizza::cheese)
                .thenApplyAsync(Pizza::toppings)
                .thenApplyAsync(Pizza::bake)
                .thenApplyAsync(Pizza::slice)
                .thenApplyAsync(Pizza::box);
    }

    public static void
    show(CompletableFuture<Pizza> cf) {
        try {
            System.out.println(cf.get());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        Timer timer = new Timer();
        List<CompletableFuture<Pizza>> pizzas =
                IntStream.range(0, QUANTITY)
                        .mapToObj(Pizza::new)
                        .map(CompletablePizza::makeCF)
                        .collect(Collectors.toList());
        System.out.println(timer.duration());
        pizzas.forEach(CompletablePizza::show);
        System.out.println(timer.duration());
    }
}
/* Output:
169
Pizza 0: ROLLED
Pizza 1: ROLLED
Pizza 2: ROLLED
Pizza 4: ROLLED
Pizza 3: ROLLED
Pizza 1: SAUCED
Pizza 0: SAUCED
Pizza 2: SAUCED
Pizza 4: SAUCED
Pizza 3: SAUCED
Pizza 0: CHEESED
Pizza 4: CHEESED
Pizza 1: CHEESED
Pizza 2: CHEESED
Pizza 3: CHEESED
Pizza 0: TOPPED
Pizza 4: TOPPED
Pizza 1: TOPPED
Pizza 2: TOPPED
Pizza 3: TOPPED
Pizza 0: BAKED
Pizza 4: BAKED
Pizza 1: BAKED
Pizza 3: BAKED
Pizza 2: BAKED
Pizza 0: SLICED
Pizza 4: SLICED
Pizza 1: SLICED
Pizza 3: SLICED
Pizza 2: SLICED
Pizza 4: BOXED
Pizza 0: BOXED
Pizza0: complete
Pizza 1: BOXED
Pizza1: complete
Pizza 3: BOXED
Pizza 2: BOXED
Pizza2: complete
Pizza3: complete
Pizza4: complete
1797
*/
